The 1986371-4 is a 3.5 mm left-hand screw clamp plug with 4 positions designed for wire-to-board applications requiring field wiring termination. This plug features a 3.5 mm pitch and provides multiple wire access angles (90° and 270°) to the header interface, allowing flexible configuration options. The housing is constructed from PA 6.6 with nickel-plated brass clamps and tin-plated phosphor bronze contacts, rated for 11 amps at 300 volts and supporting wire gauges from 14-30 AWG. It operates reliably across a temperature range of -40°C to +110°C and mates with industry standard headers on the same centerline spacing. The plug is end-to-end stackable without loss of centerline spacing, making it ideal for industrial controls, HVAC systems, and other applications requiring robust field-terminated connections.